The most common type of → meteorites containing
→ chondrules. These
→ stony meteorites make up about 86% of all
meteorites. An important feature of the chondrites is that, with the
exception of a few highly → volatile
elements, they have the same composition as the Sun.

A group of very rare → carbonaceous chondrites
which are unusual because they do not have → chondrules.
They are thought to be the most primitive of all meteorites.
As a result of alteration, they lack chondrules and → CAIs,
but contain up to 20% water, as well as various alteration minerals.
Only five CI chondrite falls are known, and of these, only four are massive enough
for multiple chemical analyses. The Orgueil meteorite is the most massive of
CI chondrites.

C for → carbon, I stands for
Ivuna meteorite that fell in Tanzania in 1938; → chondrite.